Key Records:
1) 4871bis-compliant code [MUST|SHOULD|MAY] be able to use
4871-compliant key records
SHOULD, in the classic "you should have a good reason not to" sense.
2) 4871-compliant code [MUST|SHOULD|MAY] be able to use
4871bis-compliant key records
MAY
Signatures:
3) 4871-compliant code generated signatures [MUST|SHOULD|MAY] be
verifiable by 4871bis-compliant code
SHOULD, as above.
4) 4871bis-compliant code generated signatures [MUST|SHOULD|MAY] be
verifiable by 4871-compliant code
MAY
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